Reference voltage circuit

Details Reference voltage circuit Reference voltage circuit

2008-07-18

2011-10-18

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

C323S314000, C323S316000, C327S538000, C327S539000

Reexamination Certificate

active

08040123

ABSTRACT:
A reference voltage circuit that obtains a precisely constant voltage by compensating a temperature variation of a reference voltage circuit using band gap voltage. A p-type MOS transistor (PNP) outputs a reference voltage according to a control voltage, and provides respective PNPs having diode connections with currents corresponding to the reference voltage. A temperature compensation unit adds compensation currents proportional to the second power of absolute current to currents flowing in the respective PNPs, so that both voltages generated corresponding to the currents flowing in the respective PNPs become the same in the case where the band gap unit has temperature characteristics including a peak value. The band gap unit has a differential amplifier for outputting the control voltage. In the case where the band gap unit has a bottom value, the compensation unit subtracts the above compensation currents from the currents flowing in the respective PNPs.

REFERENCES:
patent: 5856742 (1999-01-01), Vulih et al.
patent: 7215183 (2007-05-01), Nakada
patent: 7514987 (2009-04-01), Lin
patent: 7532063 (2009-05-01), Lee
patent: 2004206633 (2004-07-01), None

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